Method of and apparatus for sending signal-impulses.



A. N. HOVLAND.

METHOD OF AND APPARATUS FOR SENDING SIGNAL IMPULSES.

' APPLICATION FILED FEB. 12, 1912.

1 133,726; Patented Mar. 30, 1915.

ABRAHAM NIELSEN HOVLAND, 0F CHRISTIANIA, NORWAY.

METHOD OF AND APPARATUS FOR SENDING SIGNAL-IMPULSES.

Specification of Letters Patent.

Patented Mar. 3%, 1915.

Application filed February 12, 1912. Serial N 0. 677.168.

. Sending Signal-Impulses; and I do hereby declare the following'to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawing, and to letters orfigures of reference marked thereon, which form a part of thisspecification.

- My invention relates to a method of and apparatus for obtaining anaccurate cooperation'of two or more machines, apparatus or instrumentsin spite of variations of speed that may possibly occur.

To obtain accurate coiiperation of two or more machines or apparatus fortelegraphing purposes or for performlng a given one of several possiblemovements either in linetelegraphy or in radio-telegraphy, completesynchronism or partial synchronism with automatic control is generallymade use of.

To obviate bothsaid methods I make the manner of operation ofthe/coeperating stations such that the contact arms or the like of thestations, which at the transmitting station cause impulses of current tobe transmitted ina predetermined succession or order and which at thereceiving station transmit the action of said impulses of current tovarious members such as magnets or the like, both perform one revolutionor a reciprocating movement at a time, both commencing simultaneously atzero, and the contact, arm of the transmitter causing the contact arm ofthe receiver to be actuated at the same moment as the transmitter armcommences its motion. In'this manner the difference which might possiblyoccur in the speed of the apparatus is reduced to naught for eachindividual operation. The specific purpose ofthe switch is to allowsmall variations insynchronism between two signaling devices arrangedfor substantially synchronous operation.

The accompanying drawings. illustrate diagramatically the way in whichthe present method is carried out, Figures 1 to 4 being diagrams ofvarious contact arrangements for apparatus for carrying out said method.

In Figs. 1 and 2 are shown diagrams of contact arrangements forrectilinear reciprocating and rotary motion of the contact arm,respectively. The contacts are denoted by a, a and the contact arms byZ), b. As will be seen the intervening spaces between the contacts'areof the same size as the contacts a, themselves but they may also be ofdifferent slze.

In Figs. 3 and 4, respectively are shown diagrams. corresponding tothose shown in Figs. 1 and 2, but here the spaces 0 and the contacts aare made of increasing length, so that the first contacts are theshortest and the last contact the longest.

The latter method especially allows of great variations of speed withoutdisturbing the coeperation.

Claims:

1. The method of obtaining accurate cooperation of a plurality oftelegraph instruments, which comprises closing the circuits of saidinstruments at increasing periods and simultaneously starting theclosing of said circuits from zero position after each operation, andthereby preventing the cumulationof errors in synchronism.

2.'The method of obtaining accurate cooperation of a plurality oftelegraph instruments, which comprises sending and collecting currentimpulses in successively increasing periods, said impulses alwaysstarting from a zero position at the smallest time interval, and therebypreventing the cumulation of errors in synchronism.

- 3. A sunflower switch having a plurality of contacts insulatedfromeach other and successively increasing in length.

4. A sunflower switch having alternating insulations and conductivecontacts, both the insulations and contacts successively increasinginlength.

In testimonythat I claim the foregoing as my invention, I have signed myname in presence of two subscribing witnesses.

ABRAHAM NILSEN HOVLAND.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

